Fingerprint Sensor Embedded in Flat-Panel Display
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Solution Overview
Problem
The expansion of modern mobile devices is hindered by the need for a physical fingerprint button, which contradicts the trend towards larger touchscreens, necessitating a novel approach for fingerprint recognition within the device.
Innovation Solution
Integrating a fingerprint sensor into a flat-panel display, such as an LCD or OLED, by incorporating a photo sensor and lens region within the display's structure, allowing for fingerprint recognition without occupying additional surface space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a physical fingerprint button is disposed on the front surface of the mobile device, then fingerprint recognition function is provided, but the touchscreen area is reduced and device expandability is hindered
Solution Approach 1:
The fingerprint sensor is merged with the display structure by integrating the photo sensor and lens region into the display layers. The lens region is formed within the display structure, and the photo sensor is embedded in the display layers, allowing fingerprint recognition functionality to be combined with the display area without occupying additional surface space.
Solution Approach 2:
The fingerprint sensor components are arranged in a vertical dimension within the display structure rather than occupying horizontal surface area. The lens region is disposed above and aligned with the photo sensor vertically, creating a three-dimensional arrangement that enables fingerprint recognition without reducing the touchscreen area.
2Reliability
If a physical fingerprint button is disposed on the front surface of the mobile device, then fingerprint recognition function is provided, but the device complexity increases
Solution Approach 1:
The display structure serves multiple functions: it provides the display function and simultaneously houses the fingerprint sensor components. The first dielectric layer and subsequent display layers serve both as structural elements for the display and as integration layers for the photo sensor and lens region, reducing overall device complexity.
Solution Approach 2:
Multiple functions are merged into a single integrated structure. The fingerprint sensor components (lens region, photo sensor) are combined with the display layers, eliminating the need for a separate physical button structure and reducing device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables effective fingerprint recognition within the active display area, enhancing user experience by maintaining a larger touchscreen interface while providing secure biometric identification.
Implementation Method 1
The lens region is disposed above and substantially aligned with the photo sensor vertically
Implementation Method 2
The photo sensor is formed in the first dielectric layer
Data Source
AI summary
A flat-panel display embedded with a fingerprint sensor includes a substrate, a first dielectric layer formed on the substrate, a photo sensor formed in the first dielectric layer, and a lens region disposed above and substantially aligned with the photo sensor vertically.